ASoC: rt5640: Add jack-detect support

Add jack-detect support, loosely based on earlier work on this by:

Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Francisco mendez <francisco.mendez@intel.com>

Note getting the OVCD to work reliable was sort of finicky, so there are
quite a few comments on this to hopefully avoid people breaking it in the
future.

This (and the follow-up button press support) has been tested on the
following devices:

Acer Iconia Tab 8 W1-810
Asus T100CHI
Asus T100TA
Asus T200TA
Axxo WT1011
Chuwi Vi8
Dell Venue 8 Pro 5830
HP Pavilion X2 10-n000nd
HP Stream 7
I.T. Works TW891
Lamina I8270
MSI S100
Peaq C1010
Pipo W4
PoV MobiiTAB-P800W (v2.0)
Toshiba Click Mini L9W-B

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=196377
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 286 insertions, 0 deletions

diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c
index d7c7b207f3cc..8e306f509601 100644
--- a/sound/soc/codecs/rt5640.c
+++ b/sound/soc/codecs/rt5640.c
@@ -24,6 +24,7 @@
 #include <linux/spi/spi.h>
 #include <linux/acpi.h>
 #include <sound/core.h>
+#include <sound/jack.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -2093,6 +2094,224 @@ int rt5640_sel_asrc_clk_src(struct snd_soc_component *component,
 }
 EXPORT_SYMBOL_GPL(rt5640_sel_asrc_clk_src);
 
+static void rt5640_enable_micbias1_for_ovcd(struct snd_soc_component *component)
+{
+	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
+
+	snd_soc_dapm_mutex_lock(dapm);
+	snd_soc_dapm_force_enable_pin_unlocked(dapm, "LDO2");
+	snd_soc_dapm_force_enable_pin_unlocked(dapm, "MICBIAS1");
+	/* OVCD is unreliable when used with RCCLK as sysclk-source */
+	snd_soc_dapm_force_enable_pin_unlocked(dapm, "Platform Clock");
+	snd_soc_dapm_sync_unlocked(dapm);
+	snd_soc_dapm_mutex_unlock(dapm);
+}
+
+static void rt5640_disable_micbias1_for_ovcd(struct snd_soc_component *component)
+{
+	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
+
+	snd_soc_dapm_mutex_lock(dapm);
+	snd_soc_dapm_disable_pin_unlocked(dapm, "Platform Clock");
+	snd_soc_dapm_disable_pin_unlocked(dapm, "MICBIAS1");
+	snd_soc_dapm_disable_pin_unlocked(dapm, "LDO2");
+	snd_soc_dapm_sync_unlocked(dapm);
+	snd_soc_dapm_mutex_unlock(dapm);
+}
+
+static void rt5640_clear_micbias1_ovcd(struct snd_soc_component *component)
+{
+	snd_soc_component_update_bits(component, RT5640_IRQ_CTRL2,
+		RT5640_MB1_OC_STATUS, 0);
+}
+
+static bool rt5640_micbias1_ovcd(struct snd_soc_component *component)
+{
+	int val;
+
+	val = snd_soc_component_read32(component, RT5640_IRQ_CTRL2);
+	dev_dbg(component->dev, "irq ctrl2 %#04x\n", val);
+
+	return (val & RT5640_MB1_OC_STATUS);
+}
+
+static bool rt5640_jack_inserted(struct snd_soc_component *component)
+{
+	struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
+	int val;
+
+	val = snd_soc_component_read32(component, RT5640_INT_IRQ_ST);
+	dev_dbg(component->dev, "irq status %#04x\n", val);
+
+	if (rt5640->jd_inverted)
+		return !(val & RT5640_JD_STATUS);
+	else
+		return (val & RT5640_JD_STATUS);
+}
+
+/* Jack detect timings */
+#define JACK_SETTLE_TIME	100 /* milli seconds */
+#define JACK_DETECT_COUNT	5
+#define JACK_DETECT_MAXCOUNT	20  /* Aprox. 2 seconds worth of tries */
+
+static int rt5640_detect_headset(struct snd_soc_component *component)
+{
+	int i, headset_count = 0, headphone_count = 0;
+
+	/*
+	 * We get the insertion event before the jack is fully inserted at which
+	 * point the second ring on a TRRS connector may short the 2nd ring and
+	 * sleeve contacts, also the overcurrent detection is not entirely
+	 * reliable. So we try several times with a wait in between until we
+	 * detect the same type JACK_DETECT_COUNT times in a row.
+	 */
+	for (i = 0; i < JACK_DETECT_MAXCOUNT; i++) {
+		/* Clear any previous over-current status flag */
+		rt5640_clear_micbias1_ovcd(component);
+
+		msleep(JACK_SETTLE_TIME);
+
+		/* Check the jack is still connected before checking ovcd */
+		if (!rt5640_jack_inserted(component))
+			return 0;
+
+		if (rt5640_micbias1_ovcd(component)) {
+			/*
+			 * Over current detected, there is a short between the
+			 * 2nd ring contact and the ground, so a TRS connector
+			 * without a mic contact and thus plain headphones.
+			 */
+			dev_dbg(component->dev, "jack mic-gnd shorted\n");
+			headset_count = 0;
+			headphone_count++;
+			if (headphone_count == JACK_DETECT_COUNT)
+				return SND_JACK_HEADPHONE;
+		} else {
+			dev_dbg(component->dev, "jack mic-gnd open\n");
+			headphone_count = 0;
+			headset_count++;
+			if (headset_count == JACK_DETECT_COUNT)
+				return SND_JACK_HEADSET;
+		}
+	}
+
+	dev_err(component->dev, "Error detecting headset vs headphones, bad contact?, assuming headphones\n");
+	return SND_JACK_HEADPHONE;
+}
+
+static void rt5640_jack_work(struct work_struct *work)
+{
+	struct rt5640_priv *rt5640 =
+		container_of(work, struct rt5640_priv, jack_work);
+	struct snd_soc_component *component = rt5640->component;
+	int status;
+
+	if (!rt5640_jack_inserted(component)) {
+		/* Jack removed, or spurious IRQ? */
+		if (rt5640->jack->status & SND_JACK_HEADPHONE) {
+			snd_soc_jack_report(rt5640->jack, 0, SND_JACK_HEADSET);
+			dev_dbg(component->dev, "jack unplugged\n");
+		}
+	} else if (!(rt5640->jack->status & SND_JACK_HEADPHONE)) {
+		/* Jack inserted */
+		rt5640_enable_micbias1_for_ovcd(component);
+		status = rt5640_detect_headset(component);
+		rt5640_disable_micbias1_for_ovcd(component);
+
+		dev_dbg(component->dev, "detect status %#02x\n", status);
+		snd_soc_jack_report(rt5640->jack, status, SND_JACK_HEADSET);
+	}
+}
+
+static irqreturn_t rt5640_irq(int irq, void *data)
+{
+	struct rt5640_priv *rt5640 = data;
+
+	if (rt5640->jack)
+		queue_work(system_long_wq, &rt5640->jack_work);
+
+	return IRQ_HANDLED;
+}
+
+static void rt5640_cancel_work(void *data)
+{
+	struct rt5640_priv *rt5640 = data;
+
+	cancel_work_sync(&rt5640->jack_work);
+}
+
+static void rt5640_enable_jack_detect(struct snd_soc_component *component,
+				      struct snd_soc_jack *jack)
+{
+	struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
+
+	/* Select JD-source */
+	snd_soc_component_update_bits(component, RT5640_JD_CTRL,
+		RT5640_JD_MASK, rt5640->jd_src);
+
+	/* Selecting GPIO01 as an interrupt */
+	snd_soc_component_update_bits(component, RT5640_GPIO_CTRL1,
+		RT5640_GP1_PIN_MASK, RT5640_GP1_PIN_IRQ);
+
+	/* Set GPIO1 output */
+	snd_soc_component_update_bits(component, RT5640_GPIO_CTRL3,
+		RT5640_GP1_PF_MASK, RT5640_GP1_PF_OUT);
+
+	/* Enabling jd2 in general control 1 */
+	snd_soc_component_write(component, RT5640_DUMMY1, 0x3f41);
+
+	/* Enabling jd2 in general control 2 */
+	snd_soc_component_write(component, RT5640_DUMMY2, 0x4001);
+
+	snd_soc_component_write(component, RT5640_PR_BASE + RT5640_BIAS_CUR4,
+		0xa800 | rt5640->ovcd_sf);
+
+	snd_soc_component_update_bits(component, RT5640_MICBIAS,
+		RT5640_MIC1_OVTH_MASK | RT5640_MIC1_OVCD_MASK,
+		rt5640->ovcd_th | RT5640_MIC1_OVCD_EN);
+
+	/*
+	 * The over-current-detect is only reliable in detecting the absence
+	 * of over-current, when the mic-contact in the jack is short-circuited,
+	 * the hardware periodically retries if it can apply the bias-current
+	 * leading to the ovcd status flip-flopping 1-0-1 with it being 0 about
+	 * 10% of the time, as we poll the ovcd status bit we might hit that
+	 * 10%, so we enable sticky mode and when checking OVCD we clear the
+	 * status, msleep() a bit and then check to get a reliable reading.
+	 */
+	snd_soc_component_update_bits(component, RT5640_IRQ_CTRL2,
+		RT5640_MB1_OC_STKY_MASK, RT5640_MB1_OC_STKY_EN);
+
+	snd_soc_component_write(component, RT5640_IRQ_CTRL1,
+				RT5640_IRQ_JD_NOR);
+
+	rt5640->jack = jack;
+	enable_irq(rt5640->irq);
+	/* sync initial jack state */
+	queue_work(system_long_wq, &rt5640->jack_work);
+}
+
+static void rt5640_disable_jack_detect(struct snd_soc_component *component)
+{
+	struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component);
+
+	disable_irq(rt5640->irq);
+	rt5640_cancel_work(rt5640);
+
+	rt5640->jack = NULL;
+}
+
+static int rt5640_set_jack(struct snd_soc_component *component,
+			   struct snd_soc_jack *jack, void *data)
+{
+	if (jack)
+		rt5640_enable_jack_detect(component, jack);
+	else
+		rt5640_disable_jack_detect(component);
+
+	return 0;
+}
+
 static int rt5640_probe(struct snd_soc_component *component)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
@@ -2176,6 +2395,53 @@ static int rt5640_probe(struct snd_soc_component *component)
 	if (dmic_en)
 		rt5640_dmic_enable(component, dmic1_data_pin, dmic2_data_pin);
 
+	if (device_property_read_u32(component->dev,
+				     "realtek,jack-detect-source", &val) == 0) {
+		if (val <= RT5640_JD_SRC_GPIO4)
+			rt5640->jd_src = val << RT5640_JD_SFT;
+		else
+			dev_warn(component->dev, "Warning: Invalid jack-detect-source value: %d, leaving jack-detect disabled\n",
+				 val);
+	}
+
+	if (!device_property_read_bool(component->dev, "realtek,jack-detect-not-inverted"))
+		rt5640->jd_inverted = true;
+
+	/*
+	 * Testing on various boards has shown that good defaults for the OVCD
+	 * threshold and scale-factor are 2000µA and 0.75. For an effective
+	 * limit of 1500µA, this seems to be more reliable then 1500µA and 1.0.
+	 */
+	rt5640->ovcd_th = RT5640_MIC1_OVTH_2000UA;
+	rt5640->ovcd_sf = RT5640_MIC_OVCD_SF_0P75;
+
+	if (device_property_read_u32(component->dev,
+			"realtek,over-current-threshold-microamp", &val) == 0) {
+		switch (val) {
+		case 600:
+			rt5640->ovcd_th = RT5640_MIC1_OVTH_600UA;
+			break;
+		case 1500:
+			rt5640->ovcd_th = RT5640_MIC1_OVTH_1500UA;
+			break;
+		case 2000:
+			rt5640->ovcd_th = RT5640_MIC1_OVTH_2000UA;
+			break;
+		default:
+			dev_warn(component->dev, "Warning: Invalid over-current-threshold-microamp value: %d, defaulting to 2000uA\n",
+				 val);
+		}
+	}
+
+	if (device_property_read_u32(component->dev,
+			"realtek,over-current-scale-factor", &val) == 0) {
+		if (val <= RT5640_OVCD_SF_1P5)
+			rt5640->ovcd_sf = val << RT5640_MIC_OVCD_SF_SFT;
+		else
+			dev_warn(component->dev, "Warning: Invalid over-current-scale-factor value: %d, defaulting to 0.75\n",
+				 val);
+	}
+
 	return 0;
 }
 
@@ -2276,6 +2542,7 @@ static const struct snd_soc_component_driver soc_component_dev_rt5640 = {
 	.suspend		= rt5640_suspend,
 	.resume			= rt5640_resume,
 	.set_bias_level		= rt5640_set_bias_level,
+	.set_jack		= rt5640_set_jack,
 	.controls		= rt5640_snd_controls,
 	.num_controls		= ARRAY_SIZE(rt5640_snd_controls),
 	.dapm_widgets		= rt5640_dapm_widgets,
@@ -2409,6 +2676,25 @@ static int rt5640_i2c_probe(struct i2c_client *i2c,
 				RT5640_MCLK_DET, RT5640_MCLK_DET);
 
 	rt5640->hp_mute = 1;
+	rt5640->irq = i2c->irq;
+	INIT_WORK(&rt5640->jack_work, rt5640_jack_work);
+
+	/* Make sure work is stopped on probe-error / remove */
+	ret = devm_add_action_or_reset(&i2c->dev, rt5640_cancel_work, rt5640);
+	if (ret)
+		return ret;
+
+	ret = devm_request_irq(&i2c->dev, rt5640->irq, rt5640_irq,
+			       IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
+			       | IRQF_ONESHOT, "rt5640", rt5640);
+	if (ret == 0) {
+		/* Gets re-enabled by rt5640_set_jack() */
+		disable_irq(rt5640->irq);
+	} else {
+		dev_warn(&i2c->dev, "Failed to reguest IRQ %d: %d\n",
+			 rt5640->irq, ret);
+		rt5640->irq = -ENXIO;
+	}
 
 	return devm_snd_soc_register_component(&i2c->dev,
 				      &soc_component_dev_rt5640,